If Santos' proposed takeover of Oil Search goes ahead, the Australian newspaper reported on Friday.
Marape met with Santos CEO Kevin Gallagher and Oil Search CEO Peter Fredericson in Port Moresby on Wednesday to discuss the deal, which the government has said must meet the national interest.
The newspaper, citing unnamed sources, said the cash-strapped Papua New Guinea government, which needs to give permission for the takeover to proceed, would expect to acquire a stake for a low price or potentially via a loan.